Tropospheric Chemistry: Instruments

Acid CIMS (Chemical Ionization Mass Spectrometer) decommissioned

Acid CIMS instrument
Acid CIMS instrument

Principle of the Measurement

Negative ion proton transfer chemical ionization mass spectrometry using acetate ions as reagent ions

Species Measured

Time Response

10 second (nominal)

Detection Limit

5 - 50 pptv (background limited)


±(20% + det. limit)

Field Projects

Key Publications

Roberts, J.M., P.R. Veres, A.K. Cochran, C. Warneke, I.R. Burling, R.J. Yokelson, B. Lerner, J.B. Gilman, W.C. Kuster, R Fall, and J. de Gouw, Isocyanic acid in the atmosphere and its possible link to smoke-related health effects, Proc. Natl. Acad. Sci., doi:10.1073/pnas.1103352108, 2011.

Roberts, J.M., P. Veres, C. Warneke, J.A. Neuman, R. Washenfelder, S.S. Brown, M. Baasandorj, J. Burkholder, I.R. Burling, T.J. Johnson, R.J. Yokelson, and J. de Gouw, Measurement of HONO, HNCO, and other inorganic acids by negative-ion proton-transfer chemical-ionization mass spectrometry (NI-PT-CIMS): Application to biomass burning emissions, Atmos. Meas. Tech., doi:10.5194/amt-3-981-2010, 2010.

Veres, P., J.M. Roberts, I.R. Burling, C. Warneke, J. de Gouw, R.J. Yokelson, Measurements of gas-phase inorganic and organic acids from biomass fires by negative-ion proton-transfer chemical-ionization mass spectrometry (NI-PT-CIMS), J. Geophys. Res., doi:10.1029/2010JD014033, 2010.

Veres, P., J.M. Roberts, C. Warneke, D. Welsh-Bon, M. Zahniser, S. Herndon, R. Fall, and J. de Gouw, Development of Negative-Ion Proton-Transfer Chemical-Ionization Mass Spectrometry (NI-PT-CIMS) for the Measurement of Gas-Phase Organic Acids in the Atmosphere, Int. J. Mass Spectrom., doi:10.1016/j.ijms.2008.04.032, 2008.